Electric switch



R. CLORE.

ELECTRIC SWITCH.

APPLICATION FILED JUNE23 1917.

1,335,558. Patented Mar. 30, 1920.

Fig. 1. v I

W/T/VESS. 9 l3 7 6 and "UNITED STATES @FFTQE.

ROY GLOBE, OF INDIANAPOLIS, INDIANA, ASSIGNOB 'IO S'WARTZ ELECTRIC COMPANY, OF INDIANAPOLIS, INDIANA, A CORPORATION OF INDIANA.

ELECTRIC SY/VITCI-I.

Application filed June 23, 1917.

Z '0 all whom it may concern:

Be it known that I, ROY GLOBE, a citizen of the United States, residing at Indianapolis, Marion county, and State of Indiana, have invented and discovered certain new useful Improvements in Electric Switches, of which the following is a specification.

My invention relates to electric switches and its objects are to provide an efi'ective form of contact closer particularly adapted for use in an electromagnetic switch having an oscillating armature operated in one direction automatically and in part electrically and for use in conjunction with a plurality of pairs of contacts.

To this end my invention is embodied in preferable form in the arrangement and construction hereinafter described and illustrated'in the accompanying drawings.

In these drawings Figure 1, is a horizontal section through an electromagnetic switch having an oscillating armature containing my improvements, and Fig. 2, a front view in elevation thereof.

Referring to the drawings, 1 indicates the series windings of an electromagnetic switch, and 2 the shunt wound oscillating armature thereof. Mounted on the shaft 3, of the armature adjacent one end thereof, is a disk 1, made of fiber or. other suitable nonconducting and insulating material. This disk has a narrow, smooth curved edge along its periphery. Fixed in this peripheral edge of the disk are two projecting con tact closing segmental plates 5, which are insulated from one another and from the armature shaft by means of the body of the disk t. The disk must have sufficient body to support these plates which are secured by pins 16, passing through the disk, and therefore to obtain the narrow bearing edge, the disk is beveled outwardly from its hub through which the pins pass to its periphery. The plates 5 are of metal and they project a short distance beyond the periphery of the body of the disk 4:, and constitute cam surfaces adapted to press against the contacts for closing the latter. These segmental cam plates consist of thin sheets of metal, and owing to the metal of which they are formed they offer less friction against the contacts than the fibrous material of the body of the disk.

Mounted on a suitable base 6, is a yield Specification of Letters Patent.

Patented Mar. 30, 1920.

Serial No. 176,551.

able spring contact member '7, shaped to make and break contact with a stationary contact member 8. On the other side of the cam carrying member 1, is mounted a similar yieldable spring contact member 9, cooperating with a stationary contact member 10. These contacts may be suitably connected with any electrical devices to be controlled by the switch. The movable spring contacts 7 and 9 are adapted to bear against the periphery of the member 4:, and when the portions of the disk between the two cam portions 5 are against the contacts the latter are in open position. Upon an oscillation of the armature shaft sufficiently far to carry the cam plates 5 against the sprin contacts 7 and 9, the latter will be carried against the respective fixed contacts 8 and 10, and the circuit closed.

The outer end of the armature shaft is provided with a hub 11, which may be formed with a suitable socket 12, adapted to receive a key for turning the armature shaft and the cammember by hand for the purpose of closing the contacts. At the opposite end of the armature shaft the same is provided with an adjustable weight 13, which tends normally to carry the armature shaft and the cam member into contact opening position. This weight is normally held in vertical position by means of a stop 14, and the shaft is prevented from being turned beyond the contact closing position by means of a stop 15, adapted to bear against the upper side of the weight.

In the operation of a switch of the character here shown the cam member is adapted to be turned by hand in one direction to close the contacts, although if desired this operation may be performed electrically, and it is adapted to be held in closed position by the attractive force of the oscillating motor switch exerted through the series winding which in turn is opposed by the weight and the shunt winding. The switch is adapted to be opened by a variation in the electro-motive force between the shunt and series windings, the force of the shunt winding added to that of the weight serving to overcome the strength of the series winding. In a switch thus controlled in part or entirely by electrical action, the insulated, metallic members perform an important function in their movement against the surfaces of the contacts, in that they produce but slight friction as compared with the fibrous material of the disk and the cam member is thus enabled to respond to slight changes in electrical force in the motor, and to an extent this would be impossible with contact closing members of fiber or similar material owing to the friction produced thereby.

Having thus described my invention, what I claim is 1. An electric switch having a pair of contacts one of which has a movable spring arm, an oscillating contactclosing disk having a body of non-conducting material, electron'iagnetic elements including an oscillating member controlled in movement by variations in electromotive force and on which member said disk is mounted, and metallic projecting plates set in the periphcry of the disk and adapted to bear against said movable contact in the rotation of the disk to close the contacts.

2. An electromagnetic switch having an oscillating armature and a shaft therefor, and having two pairs of contact members, a contact of each pair comprising a movable spring arm, a rotatable contact closing disk having a body of nonconducting material and having opposite separated and insulated metallic cam plates mounted in the body of said disk and insulated thereby and projecting beyond the periphery thereof, said plates being adapted to be carried against the movable contacts to close the latter when the disk is rotated, said shaft and disk being movable under variations in electromotive force through the switch.

3. In an electro-magnetically operated switch, a dynamo electric machine having an armature and shaft, a non-conducting disk having a narrow edge fixed to said shaft, and a contact piece adapted to close a circuit set in said edge.

i. In an electro-magnetically operated switch, a dynamo electric machine having an armature and shaft, a non-conducting disk having a narrow edge fixed to said shaft, and a plurality of metallic contact pieces adapted to close a plurality of circuits set on opposite sides along said edge.

In witness whereof I have hereunto set my hand and seal at Indianapolis, this 12th day of June, A. D. nineteen hundred and seventeen.

ROY GLOBE. [n s] Witnesses:

T. H. CRAIG, T. B. FRYER. 

